folloup to color question

I changed the background in my view in the OnPrepareDC function.This is the code I use:
CBrush Br(RGB(0,0,0));
CRect rcBounds;
 pDC->GetClipBox(&rcBounds);
 CBrush* pOldBrush = pDC->SelectObject(&Br);
 pDC->PatBlt(rcBounds.left, rcBounds.top, rcBounds.Width(), rcBounds.Height(),PATCOPY);
 pDC->SelectObject(pOldBrush);
COLORREF crBk = pDC->GetBkColor();
pDC->SetBkColor(RGB(0,0,0));
COLORREF crTxt = pDC->GetTextColor();
pDC->SetTextColor(RGB(255,0,0));

The problem is when I scroll, I see white flashes come across the screen, as if the view is being redrawn in white, before being drawn as black. Any idea what this may be? Where is it being drawn in white?

Thanks
smithcAsked:
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Tommy HuiConnect With a Mentor EngineerCommented:
The answer to that is WM_ERASEBACKGND and your class has a default brush. Your best bet is to use a memory DC to do your drawing and to then make the copy to the screen. This elminates all flashes.
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smithcAuthor Commented:
thanks
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